Miley Cyrus is NOT in the Ying Yang Twins music video tribute to her bootyful backside -- so they got the next best thing ... an impersonator with serious ass shaking skills!
TMZ obtained a clip from the Twins' new video for "Miley Cyrus" featuring a twerked out look-alike in a unicorn onesie -- an obvious parody of the singer's popular YouTube clip.
The whole video is set to drop soon -- and our spies on set say the impersonator actually gives M.C. a run for her money in the badonkadonk department.
Clap, Clap, Clap, Clap.